Create middleware/validation_middleware.js

middleware/validation_middleware.js

@@ -0,0 +1,108 @@
+class ValidationMiddleware {
+    static validateEmail(email) {
+        const emailRegex = /^[^\s@]+@[^\s@]+\.[^\s@]+$/;
+        return emailRegex.test(email);
+    }
+
+    static validateUsername(username) {
+        const usernameRegex = /^[a-zA-Z0-9_]{3,20}$/;
+        return usernameRegex.test(username);
+    }
+
+    static validatePassword(password) {
+        return password.length >= 6;
+    }
+
+    static validateRegisterData(data) {
+        const errors = [];
+
+        if (!data.username) {
+            errors.push('Username is required');
+        } else if (!this.validateUsername(data.username)) {
+            errors.push('Username must be 3-20 characters and contain only letters, numbers, and underscores');
+        }
+
+        if (!data.email) {
+            errors.push('Email is required');
+        } else if (!this.validateEmail(data.email)) {
+            errors.push('Invalid email format');
+        }
+
+        if (!data.password) {
+            errors.push('Password is required');
+        } else if (!this.validatePassword(data.password)) {
+            errors.push('Password must be at least 6 characters');
+        }
+
+        if (data.password !== data.confirmPassword) {
+            errors.push('Passwords do not match');
+        }
+
+        return {
+            isValid: errors.length === 0,
+            errors: errors
+        };
+    }
+
+    static validateLoginData(data) {
+        const errors = [];
+
+        if (!data.username) {
+            errors.push('Username is required');
+        }
+
+        if (!data.password) {
+            errors.push('Password is required');
+        }
+
+        return {
+            isValid: errors.length === 0,
+            errors: errors
+        };
+    }
+
+    static validateProfileData(data) {
+        const errors = [];
+
+        if (data.email && !this.validateEmail(data.email)) {
+            errors.push('Invalid email format');
+        }
+
+        if (data.fullName && data.fullName.length < 2) {
+            errors.push('Full name must be at least 2 characters');
+        }
+
+        return {
+            isValid: errors.length === 0,
+            errors: errors
+        };
+    }
+
+    static sanitizeInput(input) {
+        if (typeof input !== 'string') return input;
+        
+        return input
+            .replace(/</g, '&lt;')
+            .replace(/>/g, '&gt;')
+            .replace(/"/g, '&quot;')
+            .replace(/'/g, '&#x27;')
+            .replace(/\//g, '&#x2F;');
+    }
+
+    static validateExerciseAnswer(answer) {
+        const errors = [];
+
+        if (!answer || answer.trim().length === 0) {
+            errors.push('Answer cannot be empty');
+        }
+
+        if (answer.length > 10000) {
+            errors.push('Answer is too long');
+        }
+
+        return {
+            isValid: errors.length === 0,
+            errors: errors
+        };
+    }
+}